因式分解4-12(x-y)+9(x-y)的平方

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因式分解4-12(x-y)+9(x-y)的平方

因式分解4-12(x-y)+9(x-y)的平方
因式分解4-12(x-y)+9(x-y)的平方

因式分解4-12(x-y)+9(x-y)的平方
4-12(x-y)+9(x-y)²
=[2-3﹙x-y﹚]²
=﹙2-3x+3y﹚²

4-12(x-y)+9(x-y)
=【2+3(x-y)】【(2-3(x-y)]
=(2+3x-3y)(2-3x+3y)

4-12(x-y)+9(x-y)的平方
=[2-3(x-y)]²
=(2-3x+3y)²

4-12(x-y)+9(x-y)^2=2^2-2*2*3(x-y)+[3(x-y)]^2=(3x-3y-2)^2

4-12(x-y)+9(x-y)的平方=(2-3(x-y))×(2+3(x-y))=(2-3x+3y)(2+3x-3y)